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Are you sure the frame takes a 27? Could be that it originally was 27.2, could be due too grease/dirt buildup inside the tube or somebody clamped it too hard before you?
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I had the same troubles as you (seatpost and seat tube were the same size). It's because of the CNC'd surface of the seatpost. Carbon paste should solve it, but be careful not to overtighten the seatpost clamp as an extra measure. Cost me a frame and an expensive seatpost.
Heldring
Tijs
@gretsch
27.0 Thomson seatpost keeps slipping in 27.0 old steel frame. don't think the grease is excessive, don't think i'm under torquing the seatpost clamp lug.
suggestions on anti-slip measures? carbon assembly paste stuff? torque harder? some sort of seatpost collar suitable for lugged frame?